Rifle receiver



FIG. 1 is a perspective view of the rifle receiver;

FIG. 2 is a right side elevational view of the rifle receiver;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view of the rifle receiver;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a rear elevational view thereof.

The ornamental design for a rifle receiver, substantially as shown anddescribed.